Enhancing Video Viewing-Experience in Opportunistic Networks Based on SVC, an Experimental Study
Résumé
Opportunistic networks are generally characterized
by a low performance due to user mobility and non end-toend
communications, which makes it challenging to use them
in scenarios involving the transmission of large data, such as
video transmission. This article presents simulated experiments of
transmitting videos in opportunistic networks, with the objective
of enhancing user video viewing experience. We consider this
concept as a trade-off between playout delay and the delivered
quality level. To obtain the best trade-off, we propose using
Scalable Video Coding, SVC, which divides a video into multiple
unequally important layers, providing different levels of
quality. This property is exploited to transmit video layers with
unequal degrees of redundancy proportionally to their degree
of importance. Experiments were performed on different video
sequences to measure the two objective criteria. Results show that
this approach enables the video to become more quickly playable
at the destination with a low starting quality but progressively
being enhanced, providing a better viewing-experience.